路由交换技术-第0章IP地址详解.ppt

Refer to the exhibit. Which value will be configured for Default Gateway of the Local Area Connection? Answer: B 网关地址和主机的IP地址应该处于同一网段，但是网段的网络号和广播地址不能分给网关，答案 毫无疑问是B 。10.0.0.1--10.0.0.254里面除了10.0.0.249外任意一个。 Refer to the exhibit. The user at Workstation B reports that Server A cannot be reached. What is preventing Workstation B from reaching Server A? A.The IP address for Server A is a broadcast address. B.The IP address for Workstation B is a subnet address. C.The gateway for Workstation B is not on the same subnet. D.The gateway for Server A is not on the same subnet. Answer: D 主机B报告说服务器A不可达，是什么原因阻止主机B访问服务器A ?131.1.123.24/27所在网络范围为：131.1.123.0-31/27。很明显网关131.1.123.33不再范围内。 练习题－选择题 * Which of the following host addresses are members of networks that can be routed across the publicInternet? A.10.172.13.65 B.172.16.223.125 C.172.64.12.29 D.192.168.23.252 E.198.234.12.95 F.212.193.48.254 Which IP address can be assigned to an Internet interface? A.10.180.48.224 B.9.255.255.10 C.192.168.20.223 D.172.16.200.18 Answer: B What is the principle reason to use a private IP address on an internal network? A.Subnet strategy for private companies. B.Manage and scale the growth of the internal network. C.Conserve public IP addresses so that we do not run out of them. D.Allow access reserved to the devices. Answer: C 我们在内部网络中使用私有地址的根本原因是什么？ 考点分析：在局域网中使用私有IP地址，最重要的原因就是节约公网地址。因为网络发展太快，导致IPV4地址完全不够用，就出现的私网地址的概念。 内部网络使用了私有地址，如果不使用nat的话我们是没办法访问外部网络的。因为公共网络不会给私有地址路由 练习题－选择题 Answer: CEF 考查公有IP地址的范围。除了下面私有IP网段地址的外都是公有 A类：10.0.0.0/8-10.255.255.255/8 B类： 172.16.0.0/16--172.31.255.255/16 C类： 192.168.0.0/24-192.168.255.255/24 * When is it necessary to use a public IP address on a routing interface? A.Connect a router on a local network. B.Connect a router to another router. C.Allow distribution of routes between networks. D.Translate a private IP address. E.Connect a network to the Internet. Answer: E 如果在网络中使用了公有地址。那么肯定是想将网络链入internet What will happen if a private IP address is assi